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The "Background" metrics category was being set in the `backgroundMetaMetricsEvent` function. This function might not necessarily include any event at all though, so setting it here seemed inappropriate. It would also crash if `eventData.eventOpts` was not set, which is not great since that property is optional. The background category is now set in the `sendBackgroundMetaMetrics` function in `metamask-controller`. This method is used solely for event data, so it would make sense for this category to be always set. There is no functional difference, since `backgroundMetaMetricsEvent` is called solely by `sendBackgroundMetaMetrics`.